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This is a known issue with P3 3.1 and Windows XP Professional x64 Edition or Windows 2003 Server x64 Edition, which are a 64-bit Windows operating systems. These platforms are not supported platforms for P3 3.1. However P3 3.1 is a 16-bit application. Testing with Windows XP Professional x64 Edition and Windows 2003 Server x64 Edition show that P3 (and any 16-bit application) will not install on these platforms, nor can any 16-bit applications run on this platforms.

Project Planner version 3.1, Service Pack 3 has been tested on the following Microsoft Operating Systems: Desktop Operating Systems:

Microsoft Windows 95 C *

Microsoft Windows 98 SE *

Microsoft Windows ME *

Microsoft NT 4.0 SP6a *

Microsoft Windows 2000 SP4

Microsoft Windows XP SP3

Microsoft Windows Vista 32 bit

Server Operating Systems:

Microsoft NT Server 4.0 SP6a *

Microsoft 2000 Server SP4

Microsoft 2003 Server

Microsoft no longer supports these platforms, but Primavera should run successfully on these platforms. Any issues specific to these Operating Systems will not addressed by Primavera.

NOTE: Any 64-bit versions of Windows Operating Systems are NOT a supported platform for P3.